Test Sieves Wire Cloth Open Area, Weight, and Width Opening Calculator

Percent open area for wire cloth

Percent open area—the ratio of the area of the openings to the total area expressed as a percentage, that theoretically can be calculated as follows for wire cloth:
OA = (1 - Mw Dw)(1 -Ms Ds)(100)
where:

• OA = the percent open area,
• Mw = the mesh warp,
• Ms = the mesh shute,
• Dw = the diameter warp wire, and
• Ds = the diameter shute wire.

Note: Because of the irregular triangular-shaped opening formed at an angle to the plane of the filter cloth surface, the percent open area is generally not a specified parameter.

Wire cloth weight per unit area

Weight per unit area—the weight per square foot for wire cloth can be approximated (without consideration for crimp) by the following equation:

Wt/SqFt = (12 Mw (12π(Dw²/4)ρ))+(12Ms(12π(Ds²/4)ρ))

where:

Wt/SqFt = the weight (lb) per square foot,

Mw = the mesh warp,

Ms = the mesh shute;

Dw = the diameter warp wire,

Ds = the diameter shute wire,

ρ = the density of material (lb/in³) (0.2836 for plain or carbon steel), and

π = the constant 3.1416.

which for square mesh wire cloth with the same wire diameter in both the warp and shute reduces to:

Wt/SqFt=72πρMD²

where:

Wt/SqFt = the weight (lb) per square foot,

M = the mesh, and

D = the diameter wire (in decimal parts of an inch).

Width opening for wire cloth

Width opening—distance between two parallel adjacent warp or shute wires, measured in the projected plane.

Opn = (1/M) - D

where:

Opn = the width opening (in decimal parts of an inch),

M = the mesh, and

D = the diameter wire (in decimal parts of an inch).